Reinforced-concrete conduit.



M. D. PRATT. BEINFORGBD CONCRETE GONDUIT.

APPLIUAIION FILED MAY 14', 1910.

Patented Aug. 29, 1911.

3 SHEETS-EHEET1 III/II M. D. PRATT.

REINFORCED CONCRETE GONDUIT.

APPLICATION FILED MAY 14, 1910.

1,001,682. Patented Aug. 29, 1911.

M. D. PRATT. REINFORCED CONCRETE OONDUIT. APPLICATION FILED MAY 14, 1910.

Patented Aug. 29, 1911 3 SHEETS-SHEET 3.

. w 12. v I

5 113. 6 6% 11 14 I I l 1 L I "fil l l I I IN M 1H {H M! M M III M [IE 3 H q n \HHHI NH 1 lvwmwwwwwmm l regular intervals around the outer spiral 3' strength to the pipe in a longitudinal direction, and thus avoid the liability to'breakage or damage in transportation or because 0 uneyen settlement of the ground in which the coiiduit or pipe is laid; As shown in Figs. 1 and 2 the steel rods ('1 are placed at and are tied to that spiral at intervals by means of small wires 7, or they may be electrically welded, soldered or brazed thereto. The ends of these rods are preferably bent back between the two spirals with their ends 8 extending practically in contact with the turns of the spiral 4, thus serving to center the inner spiral with respect to the outer spiral. stronger than the wires of the spiral, and turning the end back as shown in Fig. 2, serves to materially strengthen the conduit sections at the ends where there is the mostliability to breakage.

The cage above described being made up of steel wires will stand much higher stresses than would be possible with a cast-iron article of the same weight, and thus I am onabled to secure the same strength as a castiron pipe with the use of a much less weight of metal, and the mortar or concrete which it is necessary to add to make up the conduitdoes not raise the weight to that of a cast-iron pipe. It will be understood that the cage above described is placed in posi-.

'tion, and the concrete is suitably molded around it so as to produce the conduit section in its completed form. These sections are then transported to the place of use and are .secured together by a joint preferably.

made as hereinafter described. In the'form of cage shown in Fig. 12 the longitudinal rods 6 "are connected to the spiral member by Wires 'Fwhich are wound spirally ;around the rods and the coils of the spirii'l 3. Inv Figs. 13 and 15 the longitudinal' rods Ware shown as electrically welded, brazed or soldered to the coils of the spiral 3. In Fig. 14 rods or "wires 6, which are' considerably lighter thanflthe main rods 6. are interwoven with the coils of the spiriil3 after the manner of weaving baskets. This forms .a rather rigid and strong-construction with which a smaller number of-longitudinal rods G'inay be used. The rod 6 shown in Fig. 14 maybe electrically welded to the coils ofthe spiral or; attached in any other suitable manner.

. lnstead of making-"the reinforced steel "cage with, the single series of longitudinal wires or rods Kl around the outer side of the outer spiral, I may make use'o-f two sets of rods land 10, 'as shownin Fig.5. 'one being ,seeuret'l to the outer spiral and the other to 'the". inner spir'al. The ends 'of the rods,

furthermore, insteadof being: turned back,

as slrow'n in Fig. 2, may be anchored in the.

concrete by an enlarged head ll, or I may thick, it may be found These rods may be larger an'd rods.

useany of the so-called deformed or twisted bars commonly used in reinforced concrete be made in the'specific form of the cage without departing from the spirit. of my invention. \Vhile I am aware'that a spiral has been used to rein.

modifications may force concrete construction, I believe the use of two spirals laced together constituting a reinforcing cage 13 new.

The sections of the conduit when they are molded or formed are provided near their It will, be understood that various' ends on the outer side with depressions or v grooves 12, and the inner surface at each end is expanded, as shown at 13, substantially on the arcof a circle. panded ends cooperate with inner and outer ring-like bands which .I use in making up the joint between sections. As shown in Figs. 1 and 2, the innerrin'g-like metal; band l-jlis-curvcd longitudinally of the conduit so as to fit the expanded portions 13 of the adjacent pipe sections which are placed end 'll iese'grooves and eX-- to end. This ring 14 is expansible and is;

preferably cut on adiagonalline 15, as shown in Fig. 1. An outer ring-like band 16 is placed around the joint between the two sections with its edges resting'in the grooves 12. vThis band is madeup of sec-.

tions secured togetherby bolts or rivets 17 or byordinary clamping means, and has a concave under surface, so that its outer edge alone will be in contact with the pipe when the sections are in position. The top sect-ion of the band 16 is providedwith an' opening 18 near its center, closed by a screw plug, the purpose of this opening" being to permit asphalt, tar orother lastic water repellentanaterial to he poure through. the

band into the space surrounding the ends of the concrete sections. In Figa2=this plastic water repellent material is. shown at 1 9 both between the adjacent-owls of the s'ections-and above those ends beneath thepla-te,

and the-result of this is that if the sections are not placed in exact 'alin'e meuti the plastic material will nevertheless make arconlplete joint preventing-leakagc. and tlnst Wlll be true even if the p pes sag after they, are

placedin'posilion., The sphericalform of the plate 14 and the abutting: inner surface of the pi pe sections also permits this change -e.-; 5 the edges 21, 22, and this material may also beplaced in the: bottom of the space be tween the ends of'the two scctions'hefore the .plastic material is poured into place. This 1' takes practically a free ball and socket inthaving the filling of waterproof mate- ',I.'ltll which prevents leakage. This material is asphalt, coal tar, or similar plastic material which may be brought into a fluid state .ltSQ/thttt it will run easily into position and .Wfllfldhefe to the ends oi the pipe section;

|.l1efilnous or cellular packing 20, not out) 'irea'ents the plastic material from escaping. butis compressible and hence permits some expansion or turning of the pipe sections on {i3 1 theijoint without affecting the gas tia'ht connnect-ion and without forcing the plastic .ma- 7 ,t'e'rial out beneath the band 16. v

In-order to use my conduit pipeto supply i l fi 'Orliqnid at. various points, it is neces- -y (to: coni'iect pipes to it, and to provide P .iiaall"of:the conduit so that. the flange will he fliish with the .inmaraud outer walls, as lizlearlyi shown.in Fig. I). in order to prevent the turning of this casting in the pipe whichwould loosen it and cause leakage, l

make one of the flanges longer in'one direction than in the other, and T n'efrraiblr make t-lreiflamge 23 oblong in shape, as slumu 1: l in Flg. 4. The w res constituting, the spirals 3 and 4 inorder to p: :s this m sting or 5 tap must. be beirt'to one sidc,,and it will be. observed that the ohlongtlanoe 2'55 is plat-en transversely of the. pipe so as to cover-the. space from which .the wires haveheen bent. Iln other words this flange covers and thus 0 protects and strengthens that portion of the conduit in which there are. no strengthening spiral Wires. This casting may be made solid when placed in position in the pipe, 'andthe passagrmvay QG-may he subsequently bored and provided with screw threads in order to receii'e the pipe which leads the gas or liquid .to the place of use, or I may. originally thread the. casting or tap, and close the opening! by a screwdbreaded :plug

.27, the opponent] ot" which has a slot 28 or other means adapting: it to be engaged by a tool, forthc purpose. of turning it, and it. will normallylm screwed into position with its outer lsnrface flush with or below the outer surface of the pipe.

eansbywrhich the connection can be con- Since my conduit is made of material which is more or less porous, l have found that it advisable to coat the interior with a. waterproof material in order to insure against leakage of the liquids'or gases contained in it. The l-uatcrial whiclrl use'is asphalt, coal tar, or similar nu'iterial, and it is applied in heated condition. The surfaces to be covered are tirst spurred or painted with a thin solution oi. the coating material preferal'ily made by dissolving asphalt in naphtha, henzin or asitnilar sol= ent', so that the coatingwill"impregnate to a slight; depth the. surface of" the com-rote. .A lltHl\'lL1;Ct)2lll]lI of asphalt or similar natrl'ial is then applied inheat'ed condition. and its adhesion to the surface will he inshred by the thin coating above mentioned. ll'hile asphalt and coal tar are probably the. most; desirable coatings to he used for conveying water or gas, 1H) inreutir vn is not confined to their use, since I may employ other materials of a like nature adapted to withstand the destructive artioniot the particular liquid or gas which is courorcd any (:Lse' the. material constitutes a he water tight coating whichTn erents leakage.

'l-laring thus described the invention wha't. is-clain'icdisf: I i i L 'A pipe having t.ll1l)t.(lt'l((l \i'ithin its wall arcintmeinQ cage composed oi? out-er and i'nuc-r'separated met al s 'iiralsflthe turns of which are parallel but. staggered magatudiually (ll tllt pipe. and longitudinal wire. laciugs at intervals around tliefcaa'e conneeding the turns of the outer' spiral with the adjacent turns of the iuurrspiralll' 2. A pipe having embedth-d within its Walls a reinforcing cage conuioshd'ofout'er and inner separated nu'tal spirals the. turns otwhich 'artparall'el hut staggered lono'i tudina'lly irt thepipe, and l llgltlltll ltflll wires secured to the cage atthe ends and count ;ing:tlu .'succe ve turns ot' the two .pi ale, thus lacing them together. 5 A concrete or cement mortar pipe having a reinforcing cage. embedded within its alls composed of inner and outer separated wire spi als, longitudinal rods anchored in the concrete walls and secured to the outer spiral, and longitudinal wire lacings pass- .ing alternately about the successive turns of the two spirals and fastening the. spirals togather. 4-. A concrete orcement; mortar pipe havinp a reinforcing cage embedded within its walls composed of inue and outerseparated wire spirals longitudinal rods secured to the. out-er spiral and having their ends doubled hack and adjacent to the. inner spiral. and longitudinal wire lacing's counectiiu the successive turns of the two spirals and fastening the spirals. t'ogethe at ii'itervals.

5." A concrete or cement i'nortar pipe hav ing a reinforcing cage embedded within its at intervals about the reinforcin each la'ein connecting each coil 0? the inner, spiral with spiral, 'and longitudinally arranged metal Walls composed of inner and outer separated diameter arranged within the outer spiral,

the coils of one spiral being parallel and in staggered relation to the coils of the other spiral, and longitudinal wire laciugs arranged at intervals about .the reinforcing member, each lacing connecting'each coil of the inner spiral with the adjacent coils of the outer spiral.

- 7. A reinforcing member for a concrete or cement mortar pipe comprising an outer metal spiral, a second metal spiral of less diameter arranged within the outer spiral, the coils of one spiral being parallel and in staggered relation to the coils of the other spiral, longitudinal wire lacings arranged atintervals about the reinforcing member, each lacing connecting each coil. of the inner spiral with the adjacent coils of the outer spiral, and longitudinally arranged. metal rods distributed around the outer spiral and connected at intervals thereto. i

8. A reinforcing member for a concrete orcement mortar pipe comprising an. outer =metal spiral, a second metal spiral of less diameter arrangedwithin the outer spiral,

the coilsof one spiral being parallel and in staggered relation toithe coils of the other spiral, longitudinal wire lacings arranged or member,

the adjacent coils of the outer rods distributed around the outer spiral and connectedat intervals thereto, said rods hav- I ing inwardly turned ends lying adjacent to the coils of the inner spiral and adapted to center the inner spiral with respect to the outer spiral;

9. The combination .with a concrete or cement mortar-pipe, of a steel reinforcing cage embedded in said pi embodying longitudinal and transverse wires secured to-,

gether, a metal casting-extending through the wall of said pipe having outer and innerv flanges flush with theouter and, inner faces of the pipe, one of isaid flanges being elongated transversely of the pipe to prevent turning and to' serve as a strengthening means for the. ipe. i

10. The com ination with a concrete or cement mortar pipe, of asteel reinforcingcage embedded in said pi embod ing a series of longitudinal ro s secure to a spiral, of a metal casting extending through the wall. of said pipe the turns of the spiral being so bent as to passby the sides of said casting, and flanges on said casting flush with the inner and outer faces of said pipe, one of said flan 'es being elongated to cover that portion 6 the spiral has been bent.

11. A reinforced concrete or cement mortar-pipe having a cage embedded within its walls composed of inner and outer separated steel wire spirals, longitudinal steel rods secured to the outer spiral having their ends bent back between the two spirals so as .to lie parallel to and against the inner spiral, and

longitudinal wire lacing passing alternately outside of the successive turns of the-two spirals to fasten the spirals'together.

In testimony whereof I afiix my signature in presence of two Witnesses.

MASON DELANO PRATT.

WVit-nesses 4 I GRACE M. fHAnoL'nRonE,

ISAAC N. Leaps, Jr.

flo

pipe from whic-h the 

